linux-kernel - Re: [PATCH V3 1/3] drivers/char/tpm: Add new device driver to support IBM vTPM

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Date:	Thu, 06 Sep 2012 07:11:45 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Kent Yoder <key@...ux.vnet.ibm.com>
Cc:	Ashley Lai <adlai@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	tpmdd-devel@...ts.sourceforge.net, linuxppc-dev@...ts.ozlabs.org,
	rcj@...ux.vnet.ibm.com, adlai@...ibm.com
Subject: Re: [PATCH V3 1/3] drivers/char/tpm: Add new device driver to
 support IBM vTPM

On Wed, 2012-09-05 at 10:46 -0500, Kent Yoder wrote:
> On Wed, Sep 05, 2012 at 01:40:07PM +1000, Benjamin Herrenschmidt wrote:
> > On Wed, 2012-08-22 at 16:42 -0500, Kent Yoder wrote:
> > > On Wed, Aug 22, 2012 at 04:17:43PM -0500, Ashley Lai wrote:
> > > > This patch adds a new device driver to support IBM virtual TPM
> > > > (vTPM) for PPC64.  IBM vTPM is supported through the adjunct
> > > > partition with firmware release 740 or higher.  With vTPM
> > > > support, each lpar is able to have its own vTPM without the
> > > > physical TPM hardware.
> > > > 
> > > > This driver provides TPM functionalities by communicating with
> > > > the vTPM adjunct partition through Hypervisor calls (Hcalls)
> > > > and Command/Response Queue (CRQ) commands.
> > > 
> > >  Thanks Ashley, I'll include this in my next pull request to James.
> > 
> > Oh ? I was about to put it in the powerpc tree ... But yeah, I notice
> > there's a change to tpm.h so it probably should be at least acked by the
> > TPM folks. As for the subsequent patches, they are powerpc specific so I
> > can add them, I don't think there's a strict dependency, is there ?
> 
>   James did accept my pull request, so these are already in
> security-next...

For the driver itself, it's not a big issue (though I did found issue
while reviewing it so it will need another round of updates). For the
code that changes arch/powerpc, especially prom_init.c, that stuff must
at the very least be acked by me (or the acting powerpc person if I'm
away) if it's going to go via a different tree.

Cheers,
Ben.

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